package com.qingke.LearnInterface;

public class Gov {
	EnvStandard provider;
	
	public void setProvider(EnvStandard env){
		provider = env;
	}
	
	public static void main(String[] args){
		Gov g1 = new Gov();
		g1.setProvider(new Person());
		g1.setProvider(new Company());
		g1.setProvider(new College());
		
	}

}
